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An "invisible thing" sneaks up in the night, arranges a clump of bananas in rectangular array, and steals off with the largest proper divisor. If there are 15 bananas, 5 disappear; 12 bananas, 6 disappear. Part of "Math That Counts" series.
Encyclopedia Britannica, 331 N. LaSalle St., Chicago, IL 60610, Phone: (312)347-7159, Toll-free: 800-323-1229, Fax: (312)294-2104, URL: http://www.britannica.com
Available on VHS
Running time 11 minutes.
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